Basting-machine



I (No Model.) A3 Sheets-Shui l.

IT. G. ROBINSON. BASTING MACHINE.

Maf/'8,9051 .PatenfedMar. 6,1888.

3 Asheets-'sheet 2,

T. c. ROBINSON.

` (No Model.)

BASTING MACHINE.

Ptented Mar. 6, 1888.

Nrren STATES- ATENT Erica.

THOMAS C. ROBINSON, OF BOSTON, ASSIGNOR TO E. BAKER VVELOH, OF

CAMBRIDGE, MASSACHUSETTS.

BASTlNG-IVIACHINE.

SPECIFICATION forming part of Letters Patent No. 378,905, dated March 6, 1888.

(No model.)

To @ZZ whom it may concer/n.-

Beit known that I, THOMAS C. ROBINSON, of Boston, in the county of Suffolk and State of Massachusetts', have invented certain new and useful Improvements in Basting-Machines, of which the following is a specification.

My invention relates to sewing-machines, and particularly to that kind of such machines as are adapted to perform the work of basting or sewing with long stitches.`

It is the object of my invention to construct a machine of the character mentioned which shall be simple in construction, cheap of manufacture, and certain and efficient in its operations, and in which the length of feed may be readily and easily adjusted.

The invention, which embraces a four-motion feed, is described and claimed hereinafter, reference being had to the accompanying drawings,and to the letters of reference marked thereon, forming a part of this specification, the same letters indicating the same parts wherever they occur.

Of the drawings, Figure 1 represents abottom plan View of a machine embodying my improvements. Eig. 2 represents a front elevation, parts being represented in section on the line 2 2, Fig. l. Fig. 3 represents a sectional rear elevation on the line 3 3, Fig. l.

a represents the bed of the machine; b, the overhanging arm; c, the standard supporting the latter; d, the needle-shaft journaled in the overhanging arm; e, the needle-bar; e', the needle; f, the presser-bar; f', the presser-foot; g, the pitman,connected at its upper end with a crank device to the needle-shaft d and at its lower end to a crank or lever, t', of short rockslots formed in the needle-plate a, said feedbar projecting at each end through slots formed in the depending fianges a2 of the bed of the machine. The feed-bar has what is comnionl y known as a four-motion77 movement imparted to it-that is, an up and down and forward and backward motion, the former operation being accomplished by means ofthe rockshafts Z m, having bearings longitudinally of the machine in the depending flanges a2 of the bed thereof, shaft Z being located near the front ofthe machine-bed and shaft m near the rear thereof. Shaft Z is provided with a crankarm, Z', extending toward the center of the bed and pivotally connected with a block, Z2, adapted to slide in a slot, k2, formed in the feed-bar k, and shaft m is provided with a crank-arm, m', (similar to crank-arm Z,) which extends toward the center of the' bed of the machine and is pivot-ally connected with block m, adapted to operate in slot k3 of feed bar 7c, s'o that as said shafts Z m are rocked in. opposite directions and in unison a vertical or up-and-down motion will be imparted to the feedbar when the latter is held from moving endwise, the slots k2 k3 in the feed-bar permitting the blocks Z2 m2 to operate without affecting the position of the bar longitudinally. Shafts Z m are given a rocking motion for the purposes before recited by means of eccentrics n n', the former, on rockshaft t, operating in the forked free end of an arm, o, connected at its other end to shaft Z, and the latter, on shuttle-shaft j, operating in the forked free endl of an arm, o', connected at its other end with Shaft m. Feed-bar k is given a to-and-fro or horizontal movement by means of an arm, p, rigidly secured at its lower end to a rock-shaft, q, and pivoted at its upper end to one end of a link, p', which at its opposite end is in turn pivoted to the feed-bar, as clearly shown in Eig. 2.

An oscillating or rocking motion is imparted to rockshaft q by means of a pitman, r, pivotally connected at its lower end with a short arm, g', rigidly secured to shaft q, said pitman being pivotally connected(as at 1") near its up per end with one end of a link, s, the other end of which is in like manner connected (as at r2) with the rearward end of a lever, t, piv- IOO oted at t to standard c. The upper end of pitman o' is forked, as shown at u, in which fork a cam, a, is adapted to operate with the effect of imparting an oscillating and vertically-reciprocating motion to pitman fr on its pivots r 1 t, as will be understood by an inspection of Fig. 3, and as is common in what is commonly known as the Singer machine. Lever t is provided with a handle, t2, and a friction device, c, operating against the sides of a slot, o', of a bracket, o2, secured to standard c, so that said lever t may be rocked upon its pivot t to bring pivot-points t yr2 in more or less nearly a vertical line with the axis of rotation of cam u', and said lever be held by its friction device c in any position to which it may be moved. Vhcn pivot-poin ts t i are brought into nearly vertical line with the axis of rotation of cam a, the vertically-reciprocating movements of pitman yr will be short, and consequently but a short rocking motion will be imparted to shaft q; but when said pivot-points are moved to a horizontal or nearly horizontal position with respect to each other the extent of movement of shalt q will be greater. Shaft 1 is mounted in brackets rw, extending down some distance from the bed-plate a, so that arm p can be made quite long in order to impart a long throw, when desired, to feed-bar k through the medium of link 12.

By the means described a vertical movement is imparted to the feed-bar, which is given a reciprocating horizontal motion by means of rock-shaft q audits connections with said bar, the change in the throw of the latter having no effect whatever upon the former, and in this way by a slight raising and lower. ing of the feed-dog I am enabled to readily get a horizontal reciprocating movement of the latter of an inch or more.

In order to prevent the thread from being drawn at a sharp angle around the sides or end of the slot in the presser-foot from the eye of the needle to the cloth when long stitches are being taken, I provide the presser-foot with a slot, x, as shown in Fig. 2, which obviates any undue tension on the thread and prevents a breaking ofthe latter or a puckering of the goods being operated upon.

Though I have been particular to describe the form and arrangement of the parts as here shown, it is obvious that these may be varied without departing from the nature or spirit of the invention.

Having thus described my invention,what I claim is l. In a basting-machine, the combination, with the feed-bar adapted to be moved vertically and horizontally, of two rock-shafts having a crank-connection each with the opposite ends of said bar to impart vertical motion thereto, and a third rock-shaft, also having a crank-connection with said bar to reciprocate the same horizontally, substantially as set forth.

2. In a basting-machine, the combination, with a slotted feed-bar, k, rockshaft l, provided with crank-arm Z', block ZZoperating in one of the slots of said bar, rock-shaft on, provided with crank-arm m', block mi, operating in the other slot of said bar, rock-shai`t q, crank-arm p, and link p', substantially as set forth.

In testimony whereofI have signed my name to this specification, in the presence of two subscribing Witnesses, this 1st day of April, A. D. 1887.

THOMAS O. ROBINSON.

Vitxiesses:

ARTHUR \V. CRossLEY, A. D. HARRISON. 

